Error :Uncaught(in promise): plugin_not_installed (image picker plugin)

am using image picker plugin for selecting multiple images from gallery …i already install it but when I fired npm install --save imagepicker command then it shows warning…and finally after ionic serve command on Dev-app " Uncaught(in promise): plugin_not_installed " …and also cordova is not available …please help me to solve problem

please help me to sort this error

Please share your code also plugin list

hey thank you for your reply am using image picker plugin for selecting multile image from gallery
i am using this code :link

am running my code on Ionic-DevApp and its showing error now : cordova not available and plugin not install…;please help me